The main purpose of the Apprenticeship Opportunity Act is to support individuals who are starting apprenticeships by ensuring that their income during the first year does not affect their eligibility for financial assistance through the Temporary Assistance for Needy Families (TANF) program. This aims to encourage more people to enter apprenticeship programs without the fear of losing vital financial support. Key provisions of the Act include a requirement for states to disregard any income earned from the first year of an apprenticeship when determining eligibility for TANF assistance.